[puntonet] VS 2010 - Reporting Services con SubReporte

[Leandro Halfon]

Hola lista...como va?
Estoy teniendo un problema con un reporte que a su vez tiene un subreporte y
no le encuentro la vuelta.
Al ejecutar el reporte, me da este error:
"Data retrieval failed for the subreport, 'mails', located at:"

Alguno sabe si hay alguna config. especial ? Googleando siempre encuentro
ejemplos para winforms y nunca para web.


Mi codigo es este:

private void SubReporteMails(object sender, SubreportProcessingEventArgs e)
        {
            try
            {
                LocalReport lr = (LocalReport)sender;
                e.DataSources.Add(new ReportDataSource("dtEmpresasMails",
lr.DataSources["dtEmpresasMails"].Value ));
            }
            finally
            {

            }
        }

        private void RenderReport(string ReportPath, object empresas, object
mails)
        {
            FileStream report = null;
            FileStream subreport = null;
            var localReport = new LocalReport { ReportPath = ReportPath };

            try
            {
                report = new
FileStream(Server.MapPath("~/Views/Consultas/Test.rdlc"), FileMode.Open,
FileAccess.Read);
                localReport.LoadReportDefinition(report);

                subreport = new
FileStream(Server.MapPath("~/Views/Consultas/EmpresaMails.rdlc"),
FileMode.Open, FileAccess.Read);
                localReport.LoadSubreportDefinition("EmpresaMails",
subreport);

                localReport.DataSources.Add(new
ReportDataSource("dtEmpresas", empresas));
                localReport.DataSources.Add(new
ReportDataSource("dtEmpresasMails", mails));

                localReport.SubreportProcessing += new
SubreportProcessingEventHandler(SubReporteMails);
                localReport.Refresh();
            }
            finally
            {
                if (report != null)
                    report.Dispose();
                if (subreport != null)
                    subreport.Dispose();
            }

            var reportType = "PDF";
            string mimeType;
            string encoding;
            string fileNameExtension;

            //The DeviceInfo settings should be changed based on the
reportType
            //http://msdn2.microsoft.com/en-us/library/ms155397.aspx
            var deviceInfo =

string.Format("<DeviceInfo><OutputFormat>{0}</OutputFormat><PageWidth>8.5in</PageWidth><PageHeight>11in</PageHeight><MarginTop>0.5in</MarginTop><MarginLeft>1in</MarginLeft><MarginRight>1in</MarginRight><MarginBottom>0.5in</MarginBottom></DeviceInfo>",
reportType);

            Warning[] warnings;
            string[] streams;

            //Render the report
            var renderedBytes = localReport.Render(
                reportType,
                deviceInfo,
                out mimeType,
                out encoding,
                out fileNameExtension,
                out streams,
                out warnings);

            //Clear the response stream and write the bytes to the
outputstream
            //Set content-disposition to "attachment" so that user is
prompted to take an action on the file (open or save)
            Response.Clear();
            Response.ContentType = mimeType;
            Response.AddHeader("content-disposition", "attachment;
filename=foo." + fileNameExtension);
            Response.BinaryWrite(renderedBytes);
            Response.End();
        }


Gracias!!!